data switched from sim2 to sim1 in fringe area?

I have sim1=voice and text, sim2=data only
Yesterday I found the phone changed the sim1 set to use data, and sim2 set to not use data. Of course this didn't work because my sim1 plan has no data.
I'm guessing the phone changed the settings when I pass through an area with no reception for sim2. Has anyone seen this behavior, and is there a way to disable it?

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